1. Why does a 7-month-old baby need to start adding complementary foods? As your baby grows, breast milk or formula milk can no longer meet its growing nutritional needs. At this time, adding appropriate complementary foods can provide your baby with more types of nutrients and help promote the development of his body and brain. At the same time, adding appropriate complementary foods can also help your baby establish healthy eating habits. 2. Precautions for adding complementary foods to 7-month-old babies 1. Gradually introduce new foods: only add one new food at a time to observe the impact on the baby’s digestion. 2. Food selection: Priority should be given to foods that are easy to digest.